IMO it is fake
I'm not completely sure one way or the other as to authenticity. It looks rather too shaky in places. Somehow it also looks like a copy.
I have tried to upload mine for comparison but for some reason it always uploads upside down when the photo is horizontal (whichever way up I save it).
The best I can do is this(!):
Whenever that happens to me, I edit the photo, cropping it slightly, save the new file and repost. It hasn't failed yet
Bingo! Thanks Jason!
Glad it worked for you
Ralf, Eva is right. I don't think your Diana is real.
I own a number of Dianas and I dont think the one posted is genuine